<template>
    <div>
  <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
       <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
       <el-breadcrumb-item>商品管理</el-breadcrumb-item>
       <el-breadcrumb-item>商品列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
        <!-- 警告区域 -->
        <el-alert show-icon title="注意：只允许为第三级分类设置相关参数!" type="warning" :closable="false"> 
        </el-alert>
    </el-card>
      
    <!-- 选择商品分类区域  -->
    <el-row class="cat_opt">
        <el-col>
            <span>选择商品分类:</span>
            <!-- 选择商品分类的联级选择框 -->
        <el-cascader
        expand-trigger="hover"
          v-model="selectedCateKeys"
          :options="catelist"
          :props="cateProps"
          @change="handleChange"></el-cascader>
        </el-col>
    </el-row>
    <!-- tab 页签区域 -->
    <el-tabs v-model="activeName" @tab-click="handleTabClick">
       <!--添加动态参数的面板  -->
    <el-tab-pane label="动态参数" name="many">
       <!-- 添加参数的按钮 -->
      <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数
       </el-button>    
       <!-- 动态参数表格 -->
       <el-table :data="manyTableData" border stripe>
           <!-- 展开行 -->
         <el-table-column type="expand">
             <template slot-scope="scope">
             <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
             <!-- 输入的文本框 -->
             <el-input
                class="input-new-tag"
                v-if="scope.row.inputVisible"
                v-model="scope.row.inputValue" 
                ref="saveTagInput"
                size="small"
                @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)"
             >
         </el-input>
         <!-- 添加按钮 -->
        <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
             </template>
         </el-table-column>
         <!-- 索引列 -->
         <el-table-column type="index"></el-table-column>
         <el-table-column label="参数名称" prop="attr_name"></el-table-column>
         <el-table-column label="操作">
             <template slot-scope="scope">
               <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
               <el-button size="mini" type="danger" icon="el-icon-edit" @click="removeParams(scope.row.attr_id)">删除</el-button>
             </template>
         </el-table-column>
       </el-table>
    </el-tab-pane> 
        <!--添加静态参数的面板  --> 
    <el-tab-pane label="静态属性" name="only">
           <!-- 添加属性的按钮 -->
     <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性
     </el-button>  
     <!-- 静态参数表格 -->
       <el-table :data="onlyTableData" border stripe>
       <!-- 展开行 -->
         <el-table-column type="expand">
             <template slot-scope="scope">
             <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable>{{item}}</el-tag>
             <!-- 输入的文本框 -->
             <el-input
                class="input-new-tag"
                v-if="scope.row.inputVisible"
                v-model="scope.row.inputValue" 
                ref="saveTagInput"
                size="small"
                @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)"
             >
         </el-input>
         <!-- 添加按钮 -->
        <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
             </template>
         </el-table-column>         <!-- 索引列 -->
         <el-table-column type="index"></el-table-column>
         <el-table-column label="属性名称" prop="attr_name"></el-table-column>
         <el-table-column label="操作">
             <template slot-scope="scope">
               <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
               <el-button size="mini" type="danger" icon="el-icon-edit">删除</el-button>
             </template>
         </el-table-column>
       </el-table>
    </el-tab-pane> 
    </el-tabs>

    <!-- 添加参数的对话框 -->
    <el-dialog
     :title="'添加'+titleText"
     :visible.sync="addDialogVisible"
     width="30%"
     @close="addDialogClosed"
      >
  <el-form ref="ruleFormRef" :model="addForm" label-width="80px" :rules="addFormRules">
     <el-form-item :label="titleText" prop="attr_name">
     <el-input v-model="addForm.attr_name"></el-input>
      </el-form-item>   
  </el-form>
       <span slot="footer" class="dialog-footer">
    <el-button @click="addCateDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
</el-dialog>

  <!-- 修改参数的对话框 -->
    <el-dialog
     :title="'添加'+titleText"
     :visible.sync="editDialogVisible"
     width="30%"
     @close="editDialogClosed"
      >
  <el-form ref="editruleFormRef" :model="editForm" label-width="80px" :rules="editFormRules">
     <el-form-item :label="titleText" prop="attr_name">
     <el-input v-model="editForm.attr_name"></el-input>
      </el-form-item>   
  </el-form>
       <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
</el-dialog>
    </div>
</template>

<script>

export default ({
   data(){
       return{
           //商品分类列表
           catelist:[],
           //级联选择框的配置对象
           cateProps:{
            value:"cat_id",
            label:"cat_name",
            children:"children"
           },
           //级联选择框双向绑定到的数组
           selectedCateKeys:[],
           //被激活的页签的名称
           activeName:'many',
           //动态参数的数据
           manyTableData:[],
           //静态参数的数据
           onlyTableData:[],
           //添加对话框的显示与隐藏
           addDialogVisible:false,
           //添加参数的表单数据对象
           addForm:{
               attr_name:""
           },
           //添加表单的验证规则对象
           addFormRules:{ 
            attr_name:[
                    {required:true,message:"请输入分类名称",trigger:"blur"}
                ]
           },
         //控制修改对话框的显示与隐藏
         editDialogVisible:false,
         //修改表单数据对象
         editForm:{
             attr_name:""
         },
         //修改表单的验证规则对象
         editFormRules:{
            attr_name:[
             {required:true,message:"请输入分类名称",trigger:"blur"}
            ]
         },
         
       }
   },
   //钩子函数
   created(){
       this.getCateList()
   },
   methods:{
       //获取所有商品分类列表
      async getCateList(){
       const {data:res} = await this.$http.get('categories')
       if(res.meta.status!==200)
       {
           return this.$message.error("获取商品分类失败")
       }
       this.catelist = res.data
       console.log(res.data)
      },
      //级联选择框变化触发
      handleChange()
      {
        this.getParamsData()
      },  

      //tab页签点击事件的处理函数
      handleTabClick()
      {
        this.getParamsData()
        console.log(this.manyTableData)
      },

      //获取参数的列表数据
      async getParamsData()
      {
          //证明选中的不是三级分类
        if(this.selectedCateKeys.length!==3)
        {
           this.selectedCateKeys = []
           this.manyTableData = []
           this.onlyTableData = []
        }
        //根据所选分类的Id,和当前所处的面板，获取对应的参数
        const{data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
            params:{sel:this.activeName}
        })

        if(res.meta.status!==200){
            return this.$message.error("获取参数列表失败")
        }
          
         res.data.forEach(item=>{
             item.attr_vals = item.attr_vals ?
              item.attr_vals.split(" ") : []
            //控制文本框的显示与隐藏
             item.inputVisible=false
         //文本框中输入的内容
               item.inputValue=""
         }) 
        if(this.activeName==='many')
        {
            this.manyTableData=res.data
        }
        else{
            this.onlyTableData=res.data
        }
     },
       //监听对话框的关闭事件
           addDialogClosed()
           {
               this.$refs.ruleFormRef.resetFields()
           },
       //点击按钮，添加参数
           addParams()
           {
               this.$refs.ruleFormRef.validate(async valid=>{
                   if(!valid) return
                  const{data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
                      attr_name:this.addForm.attr_name,
                      attr_sel:this.activeName
                  })

                  if(res.meta.status!==201)
                  {
                      return this.$message.error("添加参数失败")
                  }
               })
               this.$message.success("添加数据成功")
               this.addDialogVisible=false
               this.getParamsData()
           },
           //点击按钮修改参数
         async editParams(){
              this.$refs.editruleFormRef.validate(async valid=>{
                   if(!valid) return
                  const{data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                      attr_name:this.editForm.attr_name,
                      attr_sel:this.activeName
                  })

                  if(res.meta.status!==200)
                  {
                      return this.$message.error("修改参数失败")
                  }
                  this.$message.success("修改参数成功")
                  this.getParamsData()
                  this.editDialogVisible= false
               })
         },
         //点击按钮展示修改的对话框
         async showEditDialog(attr_id)
         {
             //查询当前参数的信息
          const{data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
              params:{attr_sel:this.activeName}
          })

          if(res.meta.status!==200)
          {
              return this.$message.error("获取参数信息失败")
          }
          this.editForm = res.data
          this.editDialogVisible = true
         },
         //重置修改的表单
         editDialogClosed()
         {
             this.$refs.editruleFormRef.resetFields()
         },
         //根据id删除对应的参数项
         async removeParams(attr_id){
            const confirmResult = await  this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
                     confirmButtonText: '确定',
                     cancelButtonText: '取消',
                     type: 'warning'
                         }).catch(err=>err)
             //用户取消了删除的操作
             if(confirmResult!=='confirm')
             {
                 return this.$message.info("已取消删除!")
             }
             //删除的业务逻辑
          const{data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)

         if(res.meta.status!==200)
          {
              return this.$message.error("删除参数信息失败")
          }
           this.$message.success("删除参数成功")
           this.getParamsData() 
        },
      
         //文本框失去焦点或按下了enter键
         async handleInputConfirm(row){
          if(row.inputValue.trim().length===0)
          {
              row.inputValue = ''
              row.inputVisible = false
              return
          }   
         //如果没有return，处理
         //将新添加的数据添加进数组中
          row.attr_vals.push(row.inputValue.trim())
          row.inputValue = ''
          row.isBtnDisabled = false
         this.saveAttrVals(row)
         },

         //button的点击
         showInput(row)
         {
           row.inputVisible = true
           //让文本框自动获取焦点
           this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
           });
         },
         //删除对应的参数可选项
        handleClose(i,row){
         row.attr_vals.splice(i,1)
         this.saveAttrVals(row)
        },

        //提交属性值
       async saveAttrVals(row)
        {
           //发起请求保存数据
          const {data:res} = await this.$http.put
          (`categories/${this.cateId}/attributes/${row.attr_id}`,{
              attr_name:row.attr_name,
              attr_sel:row.attr_sel,
              attr_vals:row.attr_vals.join()
          })

            if(res.meta.status!==200)
          {
              return this.$message.error("删除参数信息失败")
          }
           this.$message.success("删除参数成功")
        }
   },
   //计算属性
   computed:{
       //如果按钮需要被禁用返回true否则false
       isBtnDisabled()
       {
           if(this.selectedCateKeys.length!==3)
           {
               return true
           }
           return false
       },
       //当前选中的三级分类的id
       cateId()
       {
           if(this.selectedCateKeys.length===3)
           {
               return this.selectedCateKeys[2]
           }
           return null
       },
       //动态计算标题的文本
       titleText(){
           if(this.activeName==='many')
           {
               return '动态参数'
           }
           return '静态属性'
       }
   }
})
</script>
<style lang="less" scoped >
.cat_opt{
    margin: 15px 0;
}
.input-new-tag{
    width: 120px;
}
.el-tag{
    margin-right: 10px;
    margin-top: 10px;
}
</style>
